DP Chemistry (first assessment 2025)
Question 19M.2.SL.TZ2.d
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.2.SL.TZ2.d |
| Level | SL | Paper | 2 | Time zone | TZ2 |
| Command term | Sketch | Question number | d | Adapted from | N/A |
d.
[Maximum mark: 2]
19M.2.SL.TZ2.d
The experiment is repeated using the same amount of dinitrogen monoxide in the same apparatus, but at a lower temperature.
Sketch, on the axes in question 2, the graph that you would expect.
[2]
Markscheme
smaller initial gradient [✔]
initial pressure is lower AND final pressure of gas lower «by similar factor» [✔]
Examiners report
Many students drew a lower initial gradient, but most did not reflect the effect of lower temperature on pressure at constant volume and started and finished the curve at the same pressure as the original one.
Syllabus sections
Structure 1. Models of the particulate nature of matter » Structure 1.5—Ideal gases » Structure 1.5.3—The molar volume of an ideal gas is a constant at a specific temperature and pressure. Investigate the relationship between temperature, pressure and volume for a fixed mass of an ideal gas and analyse graphs relating these variables.